Pix 501 problem, I can not receive smtp messages

Currently, I can send messages but cannot receive the mail from the Internet, if I remove the Pix and connect directly to the Modem/router then I can SMTP on port 25 and SMTP mail works fine both in & out.

All what we want this Pix to allow at present is:

(a) access to Internet to all clients on the network internal

(b) allow the customers to pop mail web e-mail accounts

(c) we want to use Exchange & Outlook and accommodate our own email via the SMTP Protocol

Please find attached two documents: -.

1. a current edited config of my Pix 501 running

2. a PowerPoint of my network diagram.

I appreciate a lot of help.

Vinny.

I finally found the problem.

On the ADSL router, you have configured the same 192.168.0.0/24 network you use behind the post office

Server. This configuration will not work because it leads to a duplicate IP address range and you have routing

problems.

Change the configuration to another range of IP between the ADSL router and PIX firewall and everthing will be

work.

Note the address unique public IP that is configured, received is on the router Netgear ADSL uses all other interfaces

public IP addresses.

Recovery of the networks and the IPs:

80.x.y.z/255.255.255.x = Netgear outside intellectual property

192.168.2.0/255.255.255.0 = network between the internal Netgear and the PIX outside interface

192.168.1.0/255.255.255.0 = network between the PIX inside and the external interface of the mail server

192.168.0.0/255.255.255.0 = network between the internal interface of mail server and mail clients.

Use 192.168.2.0 255.255.255.0 for this network, and then set it 192.168.2.1 for your ADSL router inside

interface, use a static IP 192.168.2.2 255.255.255.0 on the PIX firewall outside interface.

ADSL installation:

You can choose on the Netgear between all public traffic of the 80.x.y.z IP to 192.168.2.2 transmission which is NAT or

You can transfer to forward the http, pop3 and smtp, didn't really matter, it's just important that you NAT or PAT it

for the PIX firewall.

PIX installation example:

All traffic received on the PIX outside interface for http, pop3 and smtp is then transmitted by 192.168.2.2 to mail

the server 192.168.1.2 external IP address.

outdoor IP 192.168.2.2 address 255.255.255.0

IP address inside 192.168.1.1 255.255.255.0

acl_out list access permit tcp any host 192.168.2.2 eq http

acl_out list access permit tcp any host 192.168.2.2 pop eq

acl_out list access permit tcp any host 192.168.2.2 eq smtp

Access-group acl_out in interface outside

static (inside, outside) tcp 192.168.2.2 80 192.168.1.2 80 netmask 255.255.255.255 0 0

static (inside, outside) tcp 192.168.2.2 110 192.168.1.2 110 netmask 255.255.255.255 0 0

static (inside, outside) tcp 192.168.2.2 25 192.168.1.2 25 netmask 255.255.255.255 0 0

Global 1 interface (outside)

NAT (inside) 1 0.0.0.0 0.0.0.0

Route outside 0.0.0.0 0.0.0.0 192.168.2.1

Installation of mail server:

The mail server has a default route to the PIX firewall.

Default gateway on the mail server = 192.168.1.1

Do you have NAt or PAT on the mail server internal clients to the Internet in the direction of the PIX? If not, you need to add another road on the PIX, so know the PIX the 192.168.0.0/24 network is behind the e-mail server, as this unit is the routing for this network.

Add a route on the PIX inside interface:

Route inside 192.168.0.0 255.255.255.0 192.168.1.2

E-mail clients:

All mail clients have the internal IP address of mail as default gateway server.

Default gateway = 192.168.0.3

This configuration will work 100%

Sorry if I you confused.

sincerely

Patrick

Tags: Cisco Security

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